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Frequently Asked Questions (FAQ)
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An automatic increase of the reinforcement for the deformation analysis is not possible. As soon as the deformation calculation is based on the determination of the stiffness, it is not expedient to develop an algorithm that B. increases the reinforcement at the point of maximum deformation. Such a procedure would not result in the deformation being reduced.
Therefore, the reinforcement must be increased manually.
AnswerPlease check if the structure tears due to pure load. It is possible that the increase in deformations is mainly caused by creep and shrinkage, which are not active at time 0. In the nonlinear calculation, shrinkage is considered as a strain load, which can cause additional stresses.
AnswerIn addition to the standard functions, all input tables in the program also have the block functions. They allow you to edit marked numbers and number fields in the table in one step.You can access the block functions by right-clicking in the table:1. Add - A value is added to or subtracted from the selected cells with a numerical value.2. Multiply - Cells with a numerical value are multiplied by a factor.3. Divide - Cells with a numerical value are divided by a divisor.4. Set - The value of the first selected cell is set to all cells in the selection.5. Generate - Cells between the first and the last selected row are generated by interpolation of both edge values.The "Set" function allows you to quickly transfer a value to other rows.These functions are an ideal tool for changing the existing node coordinates to a new geometry, for linear extrapolation of unit load entries to any value, for unifying the values, and much more.
For the design of a ring beam, I usually have Mz moments, which causes the formation of the compression and tension zone on the right and left of the cross-section. However, the reinforcement in CONCRETE is arranged at the top and bottom of the cross-section. How can I set the reinforcement to be arranged on the right and left?
In RF‑CONCRETE Members, the deformation in the cracked state is determined by using a coefficient "ζ" (according to EN 1992‑1‑1, 7.4.3). For this simplified method, the coefficient ζ is only determined once per member. The linear deformation is upscaled according to the governing location in the member.
In this context, it is possible to determine different coefficients ζ for the individual members. When scaling the linear deformation, jumps occur between the individual members.
To avoid this effect, it is recommended to use sets of members.
Error 108) appears if the stress analysis cannot be performed because the design situation preset for the design has not been defined.
By default, RF‑CONCRETE Surfaces requires a load or a load case from the "characteristic design situation" for the stress analysis of the reinforcing steel. If it has not been defined, the design is not performed and the corresponding error message is displayed.
To avoid this, select a "characteristic load" in the "Serviceability Limit State" tab of Window "1.1 General Data." See the video.
As an alternative, you can change the detailed settings for the serviceability limit state design, so that the stress analysis is performed with a quasi-permanent load, for example. However, this change of the default setting or standard specifications is at the discretion of the user.
First, check if the "design of deformation" has been activated in the settings for the calculation of the SLS designs.
Furthermore, check whether a load for the "quasi-permanent" design situation has been specified in the "Serviceability" tab of Window 1.1. By default, the calculation of deformations in RF‑CONCRETE Surfaces (with RF‑CONCRETE Deflect or RF‑CONCRETE NL) requires a quasi-permanent load.
For the structural components that are mostly subjected to compression, the preset optimization of the design internal forces can result in the compression axial force being assigned to the stiffening concrete strut.
In such cases, it is recommended to deactivate the optimization of design internal forces and not to use the optimization of design internal forces.
With this setting, the internal forces are not optimized and the compression force arises in the design internal forces. In the example shown, the compression force is absorbed by concrete in both situations.
No, the function for the shear force reduction that you know from RF‑CONCRETE Members is not available in RF‑CONCRETE Surfaces. RF‑CONCRETE Surfaces always performs the design in the respective FE mesh nodes or grid points.
In the first instance, the determination of the statically required reinforcement (ULS) is independent of the manual specification of the reinforcement areas.
However, if you want to perform the serviceability limit state checks, you have to manually assign the reinforcement to all surfaces selected for design in RF‑CONCRETE Surfaces.
Otherwise, RF‑CONCRETE Surfaces does not apply any reinforcement at the location for the SLS design. The statically required reinforcement is not applied in this case.
In the result windows 3.x, a message is displayed (for the unreinforced surfaces), saying that the reinforcement definition is not sufficient. No check is possible these surfaces.
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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
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